content: // Protocol Buffers - Google's data interchange format
  // Copyright 2008 Google Inc.  All rights reserved.
  // https://developers.google.com/protocol-buffers/
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  //     * Redistributions in binary form must reproduce the above
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  // in the documentation and/or other materials provided with the
  // distribution.
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  // contributors may be used to endorse or promote products derived from
  // this software without specific prior written permission.
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  package com.google.protobuf;
  
  import protobuf_unittest.UnittestProto.TestAllTypes;
  import protobuf_unittest.UnittestProto.TestAllTypesOrBuilder;
  
  import junit.framework.TestCase;
  
  /**
   * Tests for {@link SingleFieldBuilderV3}. This tests basic functionality.
   * More extensive testing is provided via other tests that exercise the
   * builder.
   *
   * @author jonp@google.com (Jon Perlow)
   */
  public class SingleFieldBuilderV3Test extends TestCase {
  
    public void testBasicUseAndInvalidations() {
      TestUtil.MockBuilderParent mockParent = new TestUtil.MockBuilderParent();
      SingleFieldBuilderV3<TestAllTypes, TestAllTypes.Builder,
          TestAllTypesOrBuilder> builder =
          new SingleFieldBuilderV3<TestAllTypes, TestAllTypes.Builder,
              TestAllTypesOrBuilder>(
              TestAllTypes.getDefaultInstance(),
              mockParent,
              false);
      assertSame(TestAllTypes.getDefaultInstance(), builder.getMessage());
      assertEquals(TestAllTypes.getDefaultInstance(),
          builder.getBuilder().buildPartial());
      assertEquals(0, mockParent.getInvalidationCount());
  
      builder.getBuilder().setOptionalInt32(10);
      assertEquals(0, mockParent.getInvalidationCount());
      TestAllTypes message = builder.build();
      assertEquals(10, message.getOptionalInt32());
  
      // Test that we receive invalidations now that build has been called.
      assertEquals(0, mockParent.getInvalidationCount());
      builder.getBuilder().setOptionalInt32(20);
      assertEquals(1, mockParent.getInvalidationCount());
  
      // Test that we don't keep getting invalidations on every change
      builder.getBuilder().setOptionalInt32(30);
      assertEquals(1, mockParent.getInvalidationCount());
  
    }
  
    public void testSetMessage() {
      TestUtil.MockBuilderParent mockParent = new TestUtil.MockBuilderParent();
      SingleFieldBuilderV3<TestAllTypes, TestAllTypes.Builder,
          TestAllTypesOrBuilder> builder =
          new SingleFieldBuilderV3<TestAllTypes, TestAllTypes.Builder,
              TestAllTypesOrBuilder>(
              TestAllTypes.getDefaultInstance(),
              mockParent,
              false);
      builder.setMessage(TestAllTypes.newBuilder().setOptionalInt32(0).build());
      assertEquals(0, builder.getMessage().getOptionalInt32());
  
      // Update message using the builder
      builder.getBuilder().setOptionalInt32(1);
      assertEquals(0, mockParent.getInvalidationCount());
      assertEquals(1, builder.getBuilder().getOptionalInt32());
      assertEquals(1, builder.getMessage().getOptionalInt32());
      builder.build();
      builder.getBuilder().setOptionalInt32(2);
      assertEquals(2, builder.getBuilder().getOptionalInt32());
      assertEquals(2, builder.getMessage().getOptionalInt32());
  
      // Make sure message stays cached
      assertSame(builder.getMessage(), builder.getMessage());
    }
  
    public void testClear() {
      TestUtil.MockBuilderParent mockParent = new TestUtil.MockBuilderParent();
      SingleFieldBuilderV3<TestAllTypes, TestAllTypes.Builder,
          TestAllTypesOrBuilder> builder =
          new SingleFieldBuilderV3<TestAllTypes, TestAllTypes.Builder,
              TestAllTypesOrBuilder>(
              TestAllTypes.getDefaultInstance(),
              mockParent,
              false);
      builder.setMessage(TestAllTypes.newBuilder().setOptionalInt32(0).build());
      assertNotSame(TestAllTypes.getDefaultInstance(), builder.getMessage());
      builder.clear();
      assertSame(TestAllTypes.getDefaultInstance(), builder.getMessage());
  
      builder.getBuilder().setOptionalInt32(1);
      assertNotSame(TestAllTypes.getDefaultInstance(), builder.getMessage());
      builder.clear();
      assertSame(TestAllTypes.getDefaultInstance(), builder.getMessage());
    }
  
    public void testMerge() {
      TestUtil.MockBuilderParent mockParent = new TestUtil.MockBuilderParent();
      SingleFieldBuilderV3<TestAllTypes, TestAllTypes.Builder,
          TestAllTypesOrBuilder> builder =
          new SingleFieldBuilderV3<TestAllTypes, TestAllTypes.Builder,
              TestAllTypesOrBuilder>(
              TestAllTypes.getDefaultInstance(),
              mockParent,
              false);
  
      // Merge into default field.
      builder.mergeFrom(TestAllTypes.getDefaultInstance());
      assertSame(TestAllTypes.getDefaultInstance(), builder.getMessage());
  
      // Merge into non-default field on existing builder.
      builder.getBuilder().setOptionalInt32(2);
      builder.mergeFrom(TestAllTypes.newBuilder()
          .setOptionalDouble(4.0)
          .buildPartial());
      assertEquals(2, builder.getMessage().getOptionalInt32());
      assertEquals(4.0, builder.getMessage().getOptionalDouble());
  
      // Merge into non-default field on existing message
      builder.setMessage(TestAllTypes.newBuilder()
          .setOptionalInt32(10)
          .buildPartial());
      builder.mergeFrom(TestAllTypes.newBuilder()
          .setOptionalDouble(5.0)
          .buildPartial());
      assertEquals(10, builder.getMessage().getOptionalInt32());
      assertEquals(5.0, builder.getMessage().getOptionalDouble());
    }
  }
  